I had the same problem. My cruise control stop working 2 months later the car wont start up. It wasnt the battery and it wasnt the starter, I was able to push the car, put it on second and turn it on using the clutch.
I took the clutch safety switch (bypass it) and the car turns on and the cruise control is working now. The were 2 safety switches, I bypassed one out and the car didnt turn on, then I bypassed the other one and everything works. Now I dont have to press the clutch to turn on the car but I have to be careful if the car is in gear before turn it on.
It could be that one safety switch is for the cruise control and one to turn the car on. Or I got lucky.
The safety switches are located on top of the clutch before the fuse box. Inside of the driving side of the car.